Not sure if this egg is fertile!!!

Hello everyone I have a broody sitting on 6 eggs at the moment they are due to hatch this upcoming weekend and 3 are fertile (veining exetera exetera. ) so I bought the other 3 up to the house and candled them and did the float test 2 failed in the float test as they sunk but the other one floated here is an image of me candling this egg. Does it look fertile to you?